Data pass control device for masking write ringing in ddr sdram and method thereof

Abstract

The present invention relates to a data pass control device for masking a ringing of a data strobe that occurs when a write operation in a DDR SDRAM is completed. The data pass control device for masking the write ringing in the DDR SDRAM can be advantageously used for masking only a section with the ringing problem during the write operation, so that any unnecessary operations during the write operation can be eliminated and a more stable write operation can be realized by eliminating a write fail.

Description

technical field [0001] The present invention relates to a kind of data transfer control device and method for covering writing oscillation in DDR SDRAM (Double Data Rate Synchronous Dynamic Random Access Memory), in particular to a method for covering when the writing operation of DDR SDRAM is completed A data transfer control device and method thereof for occurring write oscillations. Background technique [0002] A DDR SDRAM is generally a storage device that generates an internal synchronous clock clk generated from an external synchronous clock ext_clk through a DLL circuit or other circuits, and then inputs / outputs data synchronized with rising and falling edges of the internal synchronous clock clk. The internal synchronous clock clk is also called the master clock main clk. [0003] What will be described here regarding the DDR SDRAM is a specific operation, that is, how to eliminate failure or misoperation of the storage device caused by oscillation during the write...

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Problems solved by technology

[0035] 4) However, in the case of related technologies, such as figure 2 As shown, after the falling edge of the fourth data strobe signal ds, for some reason, the oscillation occurs when the data strobe signal ds returns to the termination voltage or the standby voltage

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